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When using Ozone v2.56b on Lubuntu, Ozone can't find any source files referenced from the .elf file; looking at the "Source" pane, file paths are missing the root forward-slash.
Root forward-slash was displayed in v2.54b, and source files were found correctly.

Thank you for your inquiry.
Did you move the project around by any chance or renamed folders?
To keep your project portable you can use function Project.AddPathSubstitute.
How to invoke it correctly is described int he Ozone user manual.

Thanks for your reply, I will investigate Project.AddPathSubstitute().

Please note I still believe this to be a bug, as I can make the problem recur or go away just by upgrading/downgrading Ozone, between versions v2.54b and v2.56b, loading the same .jdebug file each time.

It seems that under certain circumstances the leading slash would disappear in the Linux version.
This should be fixed now with the latest Ozone release: https://www.segger.com/downloads/jlink/#Ozone
Could you try it out and give feedback if the issue is resolved for you as well?